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Gasoline deep etherification modification method

A gasoline and etherification technology, used in the petroleum industry, processing hydrocarbon oil, refining hydrocarbon oil, etc., can solve the problems of low tertiary olefin conversion rate, low total olefin conversion rate, etc., and achieve an increase in octane number and a reduction in olefin content. , Improve the effect of liquid collection

Active Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] To sum up, in the existing light gasoline etherification technology, the acid strength H0 of the catalyst used only reaches -4.0, and only the tertiary olefins in gasoline participate in the etherification reaction. The existing gasoline etherification research believes that the etherification reaction of gasoline and methanol The optimum reaction temperature is 60-80°C, higher temperature will lead to lower conversion of tertiary olefins
Since tertiary olefins are generally 40-60% by weight of the total olefin content of gasoline, the total olefin conversion rate in gasoline etherification technology is relatively low, generally only 30%-40%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A fixed-bed catalyst evaluation device is used, and the reactor is a φ32×4×1000mm stainless steel tube with a jacket. The catalyst is loaded into the reactor, and the temperature of the reactor is controlled by the constant temperature heat transfer oil passing through the jacket of the reactor. The light fraction before 75°C obtained by fractional distillation of catalytic cracking gasoline in a refinery is used as gasoline raw material. The composition and properties of the raw material are shown in Table 1. Gasoline raw material and methanol respectively enter the reactor from the lower part of the reactor through a metering pump from the raw material storage tank, and are discharged from the top of the reactor. The reaction product is firstly sampled and analyzed through the six-way valve, then through the back pressure valve and condenser, and finally collected in the product storage tank.

[0036] The catalyst is Amberlyst 45 catalyst (commercially available, pre...

Embodiment 2

[0042] Adopt the test device and the method in embodiment 1, gasoline raw material is the same as embodiment 1, difference is that Cs 2.5 h 0.5 PW 12 o 40 / SiO 2 as a catalyst (denoted as PW / / SiO 2 , the same below), the reaction temperature is 100°C, the pressure is 1MPa, the space velocity of the gasoline feedstock is 1h -1 , the olefin content in gasoline is 45.05wt%, and the alcohol-ene ratio is 1.58:1. After the reaction system was stabilized, the online chromatography was used for sampling and analysis. The reaction conditions and results are shown in Table 2. The olefin content of light gasoline decreased from 45.05wt% to 10.52wt%, the content of etherified products in the product reached 41.62wt%, the liquid yield reached 114.81wt%, and the octane number of the product reached 101, which was 10 units higher than that of raw light gasoline .

Embodiment 3

[0047] The test device and method are the same as in Example 1, except that the catalyst is a phosphorus-modified Hβ catalyst (modified by 85% phosphoric acid with a silicon-aluminum ratio of 50Hβ molecular sieve, then kneaded and extruded with alumina, and dried at 120°C , prepared by roasting at 500°C, based on the total amount of catalyst, calculated as phosphorus, the phosphorus content is 2wt%), the reaction temperature is 100°C, the pressure is 1MPa, and the space velocity of the gasoline raw material is 1h -1 , the olefin content in gasoline is 45.05wt%, and the alcohol-ene ratio is 1.58:1. The reaction conditions and product analysis results are listed in Table 2. The olefin content of light gasoline decreased from 45.05wt% to 11.81wt%, the content of etherified products in the product reached 40.06wt%, the liquid yield reached 114.18wt%, and the octane number of the product reached 100, an increase of 9 units.

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Abstract

The invention relates to a gasoline deep etherification modification method which comprises the following steps: an olefin-containing raw material and methanol are mixed; and in the presence of a solid strongly-acidic catalyst under the olefin etherification reaction condition of 95 DEG C above, secondary carbon olefin and tertiary carbon olefin in the gasoline and methanol are subjected to etherification reaction to obtain etherified gasoline, wherein the solid strongly-acidic catalyst is a high-temperature-resistant strongly-acidic catalyst, of which the heat resistance temperature is 125-250 DEG C and the acid core strength is greater than H0=-8.According to the method provided by the invention, the tertiary carbon olefin participates in the etherification reaction, and the secondary carbon olefin also participates in the etherification reaction, thereby greatly enhancing the etherified substance content in the gasoline, lowering the olefin content, enhancing the octane number, indirectly adding more cheap alcohols into the gasoline in a mode of etherified substances, increasing the liquid yield of the gasoline and lowering the gasoline cost.

Description

technical field [0001] The invention relates to an etherification and upgrading method for gasoline containing olefins, more specifically, to a method for reacting gasoline containing olefins with alcohol to maximize the conversion of olefins into etherified products. Background technique [0002] As people pay more and more attention to environmental protection, environmental protection laws and regulations restrict the content of harmful substances such as gasoline olefins more and more strictly, and with the continuous advancement of technology, automobile engines have higher and higher requirements for the octane number of gasoline. In order to reduce the olefins in gasoline and increase the octane number of gasoline, an effective method is to carry out etherification reaction between light gasoline and methanol, so that the olefins in gasoline react with methanol and convert them into methyl tert-amyl ether and methyl tert-amyl ether. High-octane ether compounds such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G29/00C10G67/02C10G67/14
Inventor 温朗友董明会郜亮俞芳喻惠利
Owner CHINA PETROLEUM & CHEM CORP
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